[PATCH v2 0/5] spi: spi-mem: Add driver for NXP FlexSPI controller

From: Yogesh Gaur
Date: Mon Sep 17 2018 - 05:51:24 EST

- Add a driver for NXP FlexSPI host controller

FlexSPI is a flexsible SPI host controller [1], Chapter 30 page 1475,
which supports two SPI channels and up to 4 external devices.
Each channel supports Single/Dual/Quad/Octal mode data transfer (1/2/4/8 bidirectional data lines)
i.e. FlexSPI acts as an interface to external devices, maximum 4, each with up to 8
bidirectional data lines.

- Tested this driver with mtd_debug(Erase/Write/Read) utility and JFFS2
filesystem mounting and booting on NXP LX2160ARDB[2] and LX2160AQDS targets.
LX2160ARDB is having two NOR slave device connected on single bus A
i.e. A0 and A1 (CS0 and CS1).
LX2160AQDS is having two NOR slave device connected on separate buses
one flash on A0 and second on B1 i.e. (CS0 and CS3).
Verified this driver on following SPI NOR flashes:
Micron, mt35xu512aba[3], [Read - 1 bit mode]
Cypress, s25fl512s, [Read - 1/2/4 bit mode]

Support for octal flash commands and other Octal data transfer related framework
changes work is in progress.

[1] https://www.nxp.com/docs/en/reference-manual/IMXRT1050RM.pdf
[2] https://patchwork.kernel.org/project/linux-arm-kernel/list/?series=9721
[3] https://patchwork.ozlabs.org/project/linux-mtd/list/?series=63445

Yogesh Gaur (5):
spi: spi-mem: Add driver for NXP FlexSPI controller
dt-bindings: spi: add binding file for NXP FlexSPI controller
arm64: dts: lx2160a: add FlexSPI node property
arm64: defconfig: enable NXP FlexSPI driver
MAINTAINERS: add maintainers for the NXP FlexSPI driver

Changes for v2:
- Incorporated Boris review comments and drop below patches as per the comments.
- Patch 'spi: add slave device size in spi_device struct'
- Patch 'spi: add flags for octal I/O data transfer'
- Incorporated DTS and Binding file review comments of Shawn Guo and Rob Herring.

.../devicetree/bindings/spi/spi-nxp-fspi.txt | 42 +
arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts | 22 +
arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi | 12 +
arch/arm64/configs/defconfig | 1 +
drivers/spi/Kconfig | 10 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-nxp-fspi.c | 1246 ++++++++++++++++++++
8 files changed, 1340 insertions(+)
create mode 100644 Documentation/devicetree/bindings/spi/spi-nxp-fspi.txt
create mode 100644 drivers/spi/spi-nxp-fspi.c